One thing that plays a major part in a Supply Chain is sourcing. Sourcing can be tricky at times based on cost and deliverable time tables. Most major companies source from a third party when developing their products. Reason being that the cost to produce the goods does not fit the businesses needs.
This can be a major positive for the company as well as a major negative at times.
One thing is for certain, all vendors and manufacturers should be treated like partners. Terms should be defined way in advance. If the vendor does not meet the standards of the agreed upon terms they should be held accountable for next gen products and or cost relating to the original scope.